Introduction to Bird Island: Covering an area of 520 acres, it is the largest island in Nanwan Lake and is divided into a tourist development zone and a bird sanctuary. There are hundreds of thousands of herons nesting and breeding here every spring and summer. In the evening, when the birds return to their nests for food, the shadows of birds can be seen everywhere on the island, and the sounds of birds can be heard from time to time, making it a spectacular sight.